"DC Fan" hydraulic bearing technology pioneered by AVC. Similarly, it is also the basis of the oil seal bearing on the improvement comes. Hydraulic bearings have more oil than the oil seal bearing space, and a unique ring-back fuel supply circuit. Such a hydraulic bearing fan working noise is obviously reduced, life is very long, up to 40,000 hours, which is a very useful product. But not all have adopted AVC radiator hydraulic bearing fan, for example, this test only with AVC hydraulic bearing fan in the Red Knight and Dragon Knight.